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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6510261aacb00b322f5cdf6adf236c3ed5a6c90ae7e156ef0ed4dbdfb19e8dd7' 
  AND token = 'JcqTZQKAWEC4CXW/XQAin5lcCh2960Z4NQpR8aRlXZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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