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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de08373ee96fc8db2dacbe2a0fd1ffe92b1b57bc3b15de2f4f465cfb67a6a78' 
  AND token = 'pwEvejdh4rCCzlqad5d3qMhUuqmKg7P7fcxEQA9Q1JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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