SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb90358eec9626ba19c9f274aaef7c58a12e9a5031a2aef89dff69a647630701' 
  AND token = 'VrFG0+OlZbnYc2tur8zwKvb+PLBXmgLSj/gAewwqhRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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