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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7e0d3cd4edfd956552d7fc90992b5894dec717b7a403119a7a71c17fde8af8' 
  AND token = 'rdNOhRkeTTfLv0Cyk/W+zqlskTgZcA/QYUUibYGuiRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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