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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf47d9322f088d714a88fa29d0e6d83f168ef8203a9c48bd88ea5d1383c7197' 
  AND token = 'TewWAZg4WF3BmAZzJ9qXCWqyCH07pQ4ARfaCETZsVUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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