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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a155a5c19f5dc8eee9f9241bfcc7b31d3fd151fe31a9c67da158af5253e8d3a' 
  AND token = '2Z98dAhjNMWZk82WF4qefU2nip34eIoKF+tVwyCtt6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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