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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ab0c414decd78a64008d494742c7fd88a33ba646ea75b09cded4bee388dfa3' 
  AND token = 'QLNjF3b5FYI7iIZ9PL/n7aB5ULcX+MUv/gj/DEGyWi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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