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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b586b2bb1ad332b1b6e2b14621a367169a9016ee3e09a9710130dc8dd926f8f' 
  AND token = 'hqYRTf092iFclmcGSF0F++DND1tYQ7Ig4srdgOCHyI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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