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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3e9c6b2911d4376b5445db852413e8e1475d785ff3697fef1c48f1d4a38daf' 
  AND token = '7Ba3kG0V3AiWdBG5hBeuW+1UL2citfaYo6Hd72TSK48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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