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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913a744b880931fde25b572878d8ee2afb74ada3c39351db8ff7278b444869ce' 
  AND token = 'e92ytYLOJ70fo+YiPSKbsMrB7OHDIF1tlWcjJ/OlFjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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