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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771d7a3143614e9423971a0a2fd2affd1ca7738b688e455a8770e260df2569ba' 
  AND token = 'EZi6psejeeEg+/yFAXz8C9Dl+tfV11F56n/ZjOfSWRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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