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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab03091d890f9fd2848e8716cc3fd7bc2207672e2e5bec72e0c80d5722c8a8c' 
  AND token = 'Fm7gO+5HK5N7lWulWfJb4J2UT3s7EtsVOKOXq+eRMXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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