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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac256801966c5c28780fd2b6782c014c18dfbcde0b6082b6568080b9ef2dcb39' 
  AND token = '24cnzJokT0+xchLLNpUF7F1Fb/T6CFc63rKoXLM+2mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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