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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a2fb486cb163af713dd0ec70f90ff2205d735ce2ca91ba3c89f73dc5cf7870' 
  AND token = 'LyZdRTCowc9zWl2dqhXIGMfE6T0B8S+L1dZlraYfTFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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