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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85786a13589ffd76758c29d056a8b75e22e1e2ed1b828f884cee2ce134dc400' 
  AND token = '7ATgR60bvL8gqu/gSU7iBw50IVoXuV/ryBAfokvp/KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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