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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9f20121b41c3076981b510b7daac74e5b8b4cb668b0138ad44fd1aba00d151' 
  AND token = 'prY/ffkkBzccOJ6qgo0PpgmVUTrgmR/8TXSiR0S7LGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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