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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7673ff9c2bd4f26c586c1fa5067d84ffebc538fa33d543012ea4940e9aa6ec' 
  AND token = 'Un/jn2oF/tiqEGouP4ZZSGMRI3d3vE3AUpEq0f12/iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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