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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed430f5d336887de74e3b3b2d40cdb2d1c50795375728bb9a7a20901564d77e' 
  AND token = 'adtAur4DcBKC4vXMq7S0kEpDQMsHcWsBwMLJ7g+sPQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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