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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e88b52471626e2c5ff6752fa87deceacaadc2ad10bdd22c436450555498ce2' 
  AND token = 'fq3YF/zN021pYY5YhiRvWu7nqFqc8cF4AZNZaWNbpsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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