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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f7d643df6017c5cde8055f456a37b584595af42f3376a98f774bc61c46e20c' 
  AND token = 'Y5gOu9ertGcBcv8sOG1qAZmErHPtr0yPSKN0YDs1HzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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