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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92746d0c6e95e4755d47c1138a3791e1052f4b27f1f4ce0a8773ac27461d718' 
  AND token = 'SuLd024dvwVVZXQZsiCUgvQR3/S7cGDj3xGld0tUOvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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