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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f069b557d3369c0d4ca422162772dd1ddea0af3638fabd67c1f16fd0df32dd' 
  AND token = 'iLQGmr5eaBT1yanVibTVOVIlRuPA1Jv9VXf9CrfY5D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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