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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2850a6043144ae0a2770acf2539ceab90b6a14cbc2bf63928effa579437b46b7' 
  AND token = '6nAyKCwDQdFDMtSXFCJEJQng/L/p9sj4fmc8aArzQJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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