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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a02905ba558651e0bb6bcd8360c742270bb1b75c3f74f0a48a0599c7b7bd73a' 
  AND token = '1XBi1TgsgIX2uA3+e7JeqJ2ESVyKMaz2LerWusHGc1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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