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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e587560f62161febd9667719c5dad42e50aa7193644639a3fe7130bafe8cab' 
  AND token = 'zHCielU+gf+Ob4JpXi6cdESLu4EcO8YMGdc4JSNErMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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