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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9554be4bfd607efade93e4ff4a69a16f0b1be3bca3c16ae0cc38ee367e2494a6' 
  AND token = 'aXzBsu5E49T+V5rBzAWDBzOJW0yd+63Gq7wVyQDEgr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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