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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac44d82c0f07e2a8728d0fdcc86c1aa620da8d9d4f6a5fda9f52dfe9947caad6' 
  AND token = 'mFhWJlT+PlpYF8R6LH+d4E4SBhWCpe2UNkZa+MeJesA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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