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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e14a218f76b4dc9aa9b5ca8d04053bfb71bd2a1712c6648be07f53c3fb9b6cd' 
  AND token = 'I98r46NgOqAOHe9vyRoSRHTWZIBqon3BedTsaDbmqV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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