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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c077bf9d0a0bbbe7c6338392833cb79e58079f2a7d6470d9b75b084fd6003a0c' 
  AND token = 'oMo2/W620gRVKpJ57IqPsEq/CKbEElugl40BjGl2TFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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