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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c840278a38f5ee426201644f9c0ebca081ec310c203f1d52df126737f0d38735' 
  AND token = 'HwT0RF7bpu/t3B0y+ehEtfYKwy/cLRraE6BJUBY/LQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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