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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455d6d38710d4792d4f3bac24f516c85399c900812fd9c4149f108ab6a185ae7' 
  AND token = 'QJyBm2qMUW5TG5WiNWKjJK84z0P5KT4mbNF6u67UpCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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