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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c9a239e9d1e9f1b77c4aaf71d9533c919848ed70c3e522299420e9fbbf2c59' 
  AND token = 'N8kGwnDyoUInlccfpH0/vEbJkdjaVc/qNJRnbVNCP+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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