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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f796611a2773f17890911276b661c3c57193ee8a2f1d26d5a02d597eff9b9a16' 
  AND token = 'LGdNK2Db+3l01YwTu8lYRcQ7ydgnbj38rmxHo46lqR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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