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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fef2b6c0311d3e502b5dd31376609358ec104314bc474f89ec5364883bab8ec' 
  AND token = 'oG+E19sEG55OZuAUmLI2rJUIYjFAgp0YOuXEzBfcDc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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