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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '189eea27997b853a6fe49a2e3661cace45f9eedb0112e902d86672d84b30c63d' 
  AND token = 'zJTLwhIIw5pnEI0BMJr9zuuN4Nqk7PZif952+A80DWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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