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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4ad8ee0f35f2e502299d246281423fb22909fdf7808c78427999002a904987' 
  AND token = 'qbwaafnJ7WYI91BNBwJh1QClbaaQmS1/sBC9/gt4Ovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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