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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4adec187612789fed8c33064eca7fb1085a3fc0cda6ad382e007dc80e0781c' 
  AND token = 'BqBZd17gds2+uOWihc6wG2nvU1xCB6a/nhAnQqQr8b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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