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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5d9e3206cfae54f1145b082473a6281e399962254e6be8538616e1187dbdc1' 
  AND token = 'Bn0W8O+otQkiReBZmhFugi8h8x2bBADs2H1i64x7nPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}