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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4992864ff0b4d4c3cb76e20b0f672db26637e6aca407e1f45dee9197092031' 
  AND token = 'jpeiw8FLchnnOzl8aTX2kwTP+6i1IuPMQmoupK2DCFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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