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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36076a508e70c7748b69aae11c5152fec9143c5030c20bd877c1255416962c67' 
  AND token = 'quhtBZ8BF6ubJMein2wy6RCfL/Gj4fX5bqu3pNVu+V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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