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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80518edb25a83cb09b02fa4a0229f7f61ca25e64f9cf9fdc2c5ea6db886c577' 
  AND token = 'X3vToTx1kXsk1AX5v8ji5sFKZyVL0TeDEgsA2scH5v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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