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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0864b95e182343e5a2384decf1bd58b8742f5986f688e68315cf64f1d2959ba' 
  AND token = 'kTyBagz7Zd0i/RT40ZYM9dEu8Cz5bDERceVEJE6R9Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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