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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe9368b17a790fdf1682b0e42ddc4028101745ed786aa19f5f8acbf357f8b0b' 
  AND token = 'I/dsv13sNAckgBRVx8NqcDaeWAUxfAbO+G/GJbmbcYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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