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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef949c8b0760f68d211f8c456fc7fd6f47fdc7256375e713412a4734ae1f096e' 
  AND token = 'wMcuJUBvehMmPfH783gwZEMsrByTof3wCt9r9b89N2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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