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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3929f4bb50c00e1eda14f2b818a03c0b334c1930a4c4a9f85ab2c629275a981e' 
  AND token = 'bE9923gGRAKnCg8v21F7ZaHtaNKRolnlaW6BYsPHG8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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