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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e918bb520583b8aa9a001bb6d99d6bd5dfb58ca3c3967c3364896db25607c88' 
  AND token = '1Tohxr+Yy13+bGoaSs9phkxs5IcFbICqhvWfqsWb//Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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