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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affbd90c9d5e9ff38c0ea413ff079faa3a6a2fa0c360361c9638663976541530' 
  AND token = '8FBTqZrq9IZTdPMl8MdzCGgvbyI3HmjyA2Ut7xNOIOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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