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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e838888d4079ee0363bf616539182f1c2835d939f0216ab8d921de615ca1aa5' 
  AND token = '+8uc7ppPRsJkjdwwPWCcM8DKYRbFgVt6VdwR+tD5Vbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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