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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ee15da4b45cb4a870aff097dd71fbd6d0166cdae02104700cd7e4b5e45db29' 
  AND token = 'Sp2gzoF+T9g1ZKqZyZJfvlHzuy+OaJRm/1eeNVH/QTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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