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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a68c5577ac48ab4a1fe91004e19fc04bbc20cc838b045db91e26b9778a15088' 
  AND token = 'UV9OsnlpbNzU/a4+6coEnby8F9XC7x4ixnXAdP6x/Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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