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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18c5634ff0fe89e4d4c40b402b83b7fb1182fe0086c4db2c5c25a0edefc4d91' 
  AND token = 'H1SSaRvUe7z5/Rg1kwozPqlpFYxBkyWnbjwDZRMxbew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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