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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155af317ac21a95e5e8ff475174a5f91397b90becd8d6a7289da8aa7c5c03837' 
  AND token = 'u+VbEVuKb7VJ0nIpH5okjzW+Qs9e1XDehM5m6duq4JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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