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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237b20ea57d2f1bf01cc367e591d56d293515f40900a9ab5eda5351acecf4985' 
  AND token = 'WMKpUxD4gAjpttoZJjlcUEdXwdX0Z/8T6bIiSCPoMao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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