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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758a9626b6b4820caa08ded7c8f2261ea367e024a7697da1bb7c550e9c7bab55' 
  AND token = '7mViRlumEGPrCD0WfxTaWFgtGSASDzvW+E+iB3xiUXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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