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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39982a40f33124a56983b5fba1725a7b9a4c9ab6705538136af8dc63e8edbea8' 
  AND token = '51McF2qbL/RbTJ2dHgLiKE3jmRMeWeBehlhF5YNGpV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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