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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef31c475beaf6e5e55b0d88aab02b8f3fa13e6b0c7aac5281e7613d2f5f7919' 
  AND token = 'tyAVedYPsrCiiwrHcTrlvwrLD0VaOY6zL7WyHIEnKro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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