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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87affcbf5817ebd129c86facd2fd2eb2614d14dd7556eaa3f6c99fe9870b3e5d' 
  AND token = 'FxvmvaSn5pDttlV4UtrNsBFMY58bXrVB3S6lTdssmao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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