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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91582d75780d0eecd56fb64165b2ded742635d31a10af02198864a04f8ac4954' 
  AND token = 'cw6SLXOt5ZjWK3LJL/c1kSxMiYX+q6V+RdUtDu86jEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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