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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8198097a14f6efde9b27a00aec7b1a2ff325e8b36ca194e4c71dc7c8f4da56b7' 
  AND token = 'K6j0N9+V82pCngIwQRfWVNPg1Rg0iq/aU3zy1MH2qPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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